What is Chlorine Dioxide?

Chlorine dioxide is a chemical compound with the formula ClO2. Prominent uses include water purification, oral hygiene, and more recently, oral supplementation. According to third party sources:
Chlorine dioxide is used in many industrial water treatment applications as a biocide including cooling towers, process water and food processing.
Chlorine dioxide was the principal agent used in the decontamination of buildings in the United States after the 2001 anthrax attacks.
Chlorine dioxide was also used after Hurricane Katrina (2005) to eradicate dangerous mold from houses inundated by water from massive flooding.
Chlorine dioxide is less corrosive than chlorine and superior for the control of legionella bacteria.
Chlorine dioxide is more effective than chlorine against viruses, bacteria and protozoa – including the cysts of Giardia and the oocysts of Cryptosporidium (parasites).
Chlorine dioxide is the topic of author, scientist, chemist and humanitarian, Jim Humble’s book entitled, “Breakthrough, The Miracle Mineral Supplement of the 21st Century”. In Breakthrough, Humble describes how he discovered the use of chlorine dioxide as an alternative treatment for Malaria, which has since led to over 75,000 documented successful treatments of the disease in Africa. Humble’s research aims to establish MMS as a powerful alternative treatment to many pathogen-borne diseases.
Chlorine dioxide can be used to kill “disease-bearing bacteria, yeasts, molds, fungi and algae”, including MRSA and other deadly pathogens.

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MMS is not chlorine dioxide; MMS is sodium chlorite (NaClO2) 28%.
Mixing with acid briefly produces chlorous acid (HClO2), which in
successive steps oxidizes ambient chlorite (ClO2-) to produce
chlorine dioxide (ClO2). Chlorine dioxide is the yellow gas produced
in solution and diluted before use. Chlorine dioxide is a potent broad
spectrum antimicrobial agent. It is true that ascorbates and other
antioxidants taken the same day of treatment and any protein
in the stomach at the time of treatment will react with ClO2 and
render it ineffective.

Dr. Thomas Hesselink

Sources:

http://en.wikipedia.org/wiki/Chlorine_dioxide - Wikipedia, see “Uses”
Jim Humbles ebook on the Miracle Mineral
http://www.medicalnewstoday.com/articles/30105.php - “New MRSA Bacteria Killer Registered by EPA”